/Engine/Plugins/Online/OnlineServices/Source/OnlineServicesCommon/Public/Online/LobbiesCommonTypes.h
struct Params
TMap<FAccountI...
LeaveReasons
Any leaving members notified by the service.
TMap<FAccountI...
LobbyMemberSnapshots
Full snapshot for each member from the service.
FLobbyServiceSn...
LobbySnapshot
Full snapshot from the service.